JP3986980B2 - Temporary deadline structure of dam body and drilling method of dam body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temporary cutoff structure that provides a construction space by temporarily closing a water area and a method for drilling a dam dam body.
[0002]
[Prior art]
In recent years, redevelopment of existing dams has been promoted by adding or improving intake facilities and discharge facilities to existing dams. In such redevelopment, the water area around the dam dam body work area must be temporarily closed. However, because the water depth of the dam is extremely deep, the conventional method of building a sheet pile wall by driving steel sheet piles into the bottom of the bottom of the dam could not withstand a large water pressure.
[0003]
Therefore, for example, a semi-cylindrical double sheet pile wall is constructed by continuously driving an H-shaped sheet pile into the bottom of the ground, and a temporary cutoff structure is formed by placing concrete in the double sheet pile wall to make a water stop wall. It is considered (for example, Patent Document 1).
[Patent Document 1]
Japanese Patent No. 3054851 (Page 2-3, Figure 1-3)
[0004]
[Problems to be solved by the invention]
However, since the water depth of the dam is extremely deep, the method of Patent Document 1 requires a large amount of steel and concrete to provide a water blocking wall that reaches the surface of the water, and the construction cost is high, and the water blocking wall is removed after the construction is completed. Therefore, there was a problem that the disposal cost was increased.
[0005]
An object of the present invention is to make it possible to temporarily close a dam water area at a smaller scale and at a lower cost than before.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention described in claim 1 of the present invention includes, for example, a hemispherical water blocking wall 10 attached to the surface of the dam bank 20 on the water area W side, as shown in FIG. A temporary closing structure for a dam dam body comprising a filler or a water proof material filled in a construction space S surrounded by the hemispherical water blocking wall 10 and the dam dam body 20.
[0007]
According to the invention described in claim 1, a hemispherical water blocking wall can be attached to the surface of the dam dam body on the water area side, and only a necessary portion can be closed from the dam water area to be a construction space. Construction costs can be saved by saving steel and concrete necessary for construction.
Furthermore, compressive load is applied to the hemispherical water blocking wall due to water pressure, which is advantageous in terms of strength, the thickness of the water blocking wall can be reduced, and necessary steel and concrete can be further saved to save construction costs. Can do.
Moreover, since there are few steel materials, concrete, etc. used for temporary closing, the disposal cost at the time of removing a water stop wall after completion | finish of construction can also be saved.
Furthermore, when the construction space is filled with a filler or a water stop material, there is no risk that water will flow into the discharge pipe even when a discharge pipe penetrating the dam dam body is provided.
[0008]
According to the second aspect of the present invention, a hemispherical water stop wall is attached to the surface of the dam dam body on the water area side, and then the construction space surrounded by the dam dam body and the hemispherical water stop wall and the water area above. A connecting cylinder that communicates with the space of the building is provided, and after filling the interior of the construction space from the connecting cylinder with a filler or water-stopping material, the dam foundation is excavated from the opposite side of the dam body toward the construction space. This is a method for drilling a dam dam body.
[0009]
According to the second aspect of the present invention, it is possible to drain from the construction space or to carry materials into the construction space using the connecting cylinder that connects the construction space and the space above the water area. it can. In addition, after filling the construction space with filler or waterstop filler or waterstop material, the dam pier is excavated from the opposite side of the dam to the construction space, so it penetrated the dam dam body. There is no danger of water flowing in.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the following, a temporary closing method for providing a discharge pipe in an existing dam as an embodiment of the present invention will be described in detail.
FIG. 1 is a diagram showing an example of a temporary closing structure according to the present invention. A hemispherical water blocking wall 10 is formed in the vicinity of the position where the opening on the water area W side of the discharge pipe 21 penetrating the dam dam body 20 is formed. A construction space S is formed. A connecting cylinder 30 is attached to the hemispherical water blocking wall 10.
[0011]
FIG. 2 is a diagram showing a form example of the hemispherical water blocking wall 10 used in the present invention. The hemispherical water blocking wall 10 has, for example, a hemispherical shape with an opening diameter of 10 m, and includes a bank body attaching portion 11 and a connecting tube attaching portion 12. The dam body attaching portion 11 is attached to the dam dam body 20 by anchor bolts or the like. A communication cylinder 30 is attached to the communication cylinder mounting portion 12 with bolts or the like.
[0012]
As the hemispherical water blocking wall 10, reinforced concrete formed in a hemispherical shape may be used, or any material such as a concrete placed inside a hemispherical steel shell may be used. When the water blocking wall is hemispherical, a compressive load is applied to the hemispherical water blocking wall 10 by water pressure, which is advantageous in terms of strength, and the thickness of the hemispheric water blocking wall 10 can be reduced.
[0013]
As shown in FIG. 1, the connecting cylinder 30 is a pipe that connects the construction space S surrounded by the hemispherical water blocking wall 10 and the dam dam body 20 and the space A above the dam water area W. It is used for pumping out the water inside S and carrying materials into the construction space S. The connecting cylinder 30 can be formed using a pressure resistant pipe such as a reinforced concrete pipe or a steel pipe.
[0014]
The temporary closing structure of the present invention is formed as follows, for example. First, mortar is applied to the surface of the dam dam body 20 in the vicinity where the discharge pipe 21 is formed to smooth the surface.
[0015]
Next, the hemispherical water blocking wall 10 is suspended by a construction machine (not shown) provided on the upper part of the dam body 20. Next, the bank body attaching part 11 of the hemispherical water blocking wall 10 is fixed to the dam bank body 20 coated with mortar with an anchor bolt or the like.
[0016]
Next, the connecting cylinder 30 is suspended by the construction machine, and the connecting cylinder 30 is attached to the connecting cylinder attaching portion 12 of the hemispherical water blocking wall 10 attached to the dam dam body 20 with a bolt or the like.
[0017]
Next, a filler is filled into the construction space S surrounded by the hemispherical water blocking wall 10 and the dam dam body 20 from the connecting cylinder 30. As the filler, air mortar, urethane foam or the like can be used. By filling the filler, the construction space S can be drained, and the gap between the hemispherical water blocking wall 10 and the dam dam body 20 and the gap between the hemispherical water blocking wall 10 and the connecting cylinder 30 are provided. Filled with filler.
[0018]
When the discharge pipe 21 is provided in the dam dam body 20, the discharge pipe 21 is provided in the dam dam body 20 by excavating from the opposite side of the dam dam body 20 after the construction space S is filled with the filler. Can do. When the construction space S is filled with the filler, even when the discharge pipe 21 penetrates the dam body 20, water does not flow into the discharge pipe.
[0019]
Moreover, you may inject | pour a water stop material into the construction space from the connection cylinder 30 instead of filling with a filler. As the water blocking material, any water blocking material such as butyl rubber, water expansion rubber, or mortar can be used.
[0020]
According to the temporary closing structure as described above, only the necessary part is closed from the dam water area W to be the construction space S. Therefore, it is possible to greatly save the steel and concrete necessary for the construction and save the construction cost. it can.
[0021]
After completion of the construction, the connecting cylinder 30 and the hemispherical water blocking wall 10 can be disassembled in the reverse order of the above-described method and easily removed by lifting with a construction machine. Even in that case, since there are few steel materials, concrete, etc. used for temporary closing, the disposal cost for removing the water blocking wall can be saved.
[0022]
FIG. 3 is a diagram illustrating another example of the hemispherical water blocking wall 10. As shown in FIG. 3, the hemispherical water blocking wall 10 may be configured by combining a plurality of members (four members in the figure). When the water blocking wall is constituted of a plurality of members as described above, there is an advantage that the transportation to the site is facilitated.
[0023]
Alternatively, the hemispherical water blocking wall 10 and the connecting cylinder 30 may be formed by forming the mold in water and placing concrete in the mold.
[0024]
In addition, in the above embodiment, although it was set as the water stop wall which consists of concrete or steel materials, this invention is not limited to this.
In addition, it is needless to say that specific detailed structures and materials such as a method for attaching the water blocking wall to the bank body can be appropriately changed.
[0025]
【The invention's effect】
According to the invention described in claim 1, a hemispherical water blocking wall can be attached to the surface of the dam dam body on the water area side, and only a necessary portion can be closed from the dam water area to be a construction space. Construction costs can be saved by saving steel and concrete necessary for construction.
Furthermore, compressive load is applied to the hemispherical water blocking wall due to water pressure, which is advantageous in terms of strength, the thickness of the water blocking wall can be reduced, and necessary steel and concrete can be further saved to save construction costs. Can do.
Moreover, since there are few steel materials, concrete, etc. used for temporary closing, the disposal cost at the time of removing a water stop wall after completion | finish of construction can also be saved.
Furthermore, when the construction space is filled with the filler, even when a discharge pipe penetrating the dam dam body is provided, there is no risk of water flowing into the discharge pipe.
[0026]
According to the second aspect of the present invention, it is possible to drain from the construction space or to carry materials into the construction space using the connecting cylinder that connects the construction space and the space above the water area. it can. In addition, after filling the construction space with filler or waterstop filler or waterstop material, the dam pier is excavated from the opposite side of the dam to the construction space, so it penetrated the dam dam body. There is no danger of water flowing in.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a temporary closing structure according to the present invention, in which (a) is a plan view and (b) is a vertical sectional view.
2A and 2B are views showing an example of the shape of a hemispherical water blocking wall 10 used in the present invention, in which FIG. 2A is a front view seen from the water area side, and FIG.
3A and 3B are diagrams showing another example of the hemispherical water blocking wall 10 used in the present invention, in which FIG. 3A is a front view seen from the water area side, and FIG. 3B is a side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Hemispherical water blocking wall 11 Levee body attaching part 12 Connecting pipe attaching part 20 Levee body 21 Discharge pipe 30 Connecting pipe S Construction space W Water

Claims (2)

A hemispherical water blocking wall attached to the surface of the dam dam body,
A temporary closing structure for a dam dam body comprising a filler or a water proof material filled in a construction space surrounded by the hemispherical water blocking wall and the dam dam body. Attach a hemispherical water blocking wall to the surface of the dam body
Next, a connecting cylinder is provided to connect the construction space surrounded by the dam dam body and the hemispherical water blocking wall and the space above the water area,
After filling the interior of the construction space from the connecting tube with a filler or water stop material,
A method for drilling a dam dam body, wherein the dam body is excavated from the opposite side of the dam body toward the construction space.

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